Almond Moth
Cadra cautella (Walker)
📖 Description
Almond Moth (Cadra cautella — also known as the Tropical Warehouse Moth) is one of the most serious lepidopteran pests of stored nuts, dried fruits and other high-value stored food products across the Indian subcontinent and worldwide. Particularly severe in the major nut and dried fruit producing, processing and storage belts of India (Jammu & Kashmir — almonds, walnuts; Maharashtra — cashews, raisins; Karnataka — cashews; Andhra Pradesh — dates; Tamil Nadu — cashews; Gujarat — peanuts, dates; Rajasthan — dates, peanuts). India is a major producer and exporter of nuts and dried fruits (almonds — over 20,000 tonnes annually, mostly from J&K; cashews — over 700,000 tonnes annually, world’s second largest producer; peanuts — over 7 million tonnes annually, world’s second largest producer; raisins — over 100,000 tonnes annually, mostly from Maharashtra; dates — over 100,000 tonnes annually from Gujarat and Rajasthan). India’s nuts and dried fruits exports are worth over ₹10,000 crore per year — making stored product pest management a critical trade issue. The pest is unusual among stored product pests because (a) it is the most common lepidopteran pest of stored nuts and dried fruits in India — populations build up rapidly in stored high-value products, allowing severe infestations within weeks of storage, (b) the larva characteristically spins silken webs on the surface of the product (distinct from the deeper webbing of the Rice Moth which spins among the grains), (c) the larva prefers to feed on high-fat, high-sugar products like nuts and dried fruits — making it a particular threat to high-value export products, (d) the pest has a short life cycle (25-35 days at 25-30°C) allowing 6-8 overlapping generations per year in stored product — a single female lays 150-300 eggs, allowing exponential population buildup, (e) the larva contaminates the product with silk, frass, exuviae and webbing — often leading to rejection of entire export lots (importing countries have zero tolerance for live insects and webbing in nuts and dried fruits), and (f) the larva’s metabolic water increases product moisture — leading to fungal growth and mycotoxin production (Aspergillus flavus produces aflatoxins which are carcinogenic and strictly regulated in international trade — aflatoxin limits are 4-20 ppb in most importing countries). IPM with clean dry product storage (most critical preventive measure — product moisture below 8%), hermetic storage bags (PICS bags — most effective preventive technology for small lots), diatomaceous earth and Bt as preventive treatments, Cadra pheromone traps for monitoring and mass trapping, need-based fumigation with Aluminium Phosphide (most effective curative treatment — must be used by trained applicators due to toxicity), stock rotation, and storage sanitation provides effective control. The pest is a particular concern for Indian nut and dried fruit growers, processors and exporters because (i) nuts and dried fruits are high-value export products — any infestation leads to rejection of entire export lots and significant financial loss, (ii) importing countries have zero tolerance for live insects and webbing — making even small infestations catastrophic for export, (iii) aflatoxin contamination secondary to moth damage is strictly regulated in international trade, (iv) the products are stored by millions of small farmers and processors in household-level storages where pest management is difficult, and (v) the pest’s rapid population buildup means a small initial infestation can become severe within weeks.
⚠️ Symptoms to watch for
- Webbing on the surface of stored nuts and dried fruits (characteristic 'surface webbing' — distinct from the deeper webbing of the Rice Moth), feeding damage on the kernel (causes shrivelled, lightweight, discoloured nut — direct product loss), contamination of stored product with larval frass, silk, exuviae and webbing (reduces market value and consumer acceptance — often leads to product rejection), development of 'off-odours' in the product (due to larval metabolic byproducts and secondary fungal growth), increased product moisture (due to larval metabolic water) leading to fungal growth and mycotoxin production (Aspergillus, Penicillium — critical for stored nuts and dried fruits which are high-value export products), weight loss 10-25% in stored almonds within 6 months of uncontrolled infestation, complete loss of high-value export lots in heavily infested stores
🩹 Treatment
- Inspect stored product weekly for webbing (early detection critical), maintain product moisture below 8% (very dry product is unfavourable for moth development — critical for nuts and dried fruits), fumigate infested product with Aluminium Phosphide (Phostoxin) @ 1 tablet (3 g) per tonne of product or per 1.5 m³ of stack space (highly effective — penetrates product mass), apply Bacillus thuringiensis (Bt) @ 200 g/tonne of product (effective against young larvae), install pheromone traps (Cadra lure) @ 4/1,000 m² for mass trapping adult moths, use hermetic storage bags (PICS bags) for small lots
🌿 Organic treatments
- Apply Bacillus thuringiensis (Bt) @ 200 g/tonne of product (effective against young larvae — disrupts larval gut), apply diatomaceous earth (DE) @ 1 kg/tonne of product (abrades insect cuticle — causes desiccation, safe for human consumption), install Cadra pheromone traps @ 4/1,000 m² for mass trapping adult moths (highly effective — captures male moths, reduces mating), use hermetic storage bags (PICS bags — triple-layer hermetic bags that suffocate larvae and adults), apply neem oil @ 5 ml/kg of product (azadirachtin disrupts larval development), apply neem leaf powder @ 2 g/kg of product (traditional Indian method — repels ovipositing moths), apply kaolin clay @ 1 kg/tonne of product (coats product — deters oviposition), apply entomopathogenic fungus Beauveria bassiana @ 200 g/tonne of product, install light traps @ 1/1,000 m² to catch adult moths, expose infested product to sun on hot dry days (larvae and adults die at product temperature >45°C — effective for nuts and dried fruits), use modified atmosphere storage (CO2 or N2 fumigation — oxygen <1% kills all stages within 7-14 days), freeze infested product at -10°C for 7 days (kills all stages — practical for high-value lots)
🧪 Chemical treatments
- Aluminium Phosphide (Phostoxin) @ 1 tablet (3 g) per tonne of product or per 1.5 m³ of stack space (fumigant — highly effective, penetrates entire product mass, expose for 5-7 days under gas-proof cover — observe 24-hour aeration before handling), Methyl Bromide @ 32 g/m³ for 24 hours (fumigant — being phased out under Montreal Protocol due to ozone depletion — restricted use only), Spinosad 240 SC @ 1 ml/L water as a product treatment (effective against larvae — low mammalian toxicity), Pirimiphos-methyl 50 EC @ 10 ml/L water as a surface spray (effective against all stages — relatively low mammalian toxicity), Cypermethrin 10 EC @ 2 ml/L water as a surface spray — always apply with appropriate PPE, observe withholding period before product is used for human consumption, rotate fumigants and insecticides to slow resistance development
🛡️ Prevention
- Store only clean, dry, sorted product (product moisture below 8% — very dry product is unfavourable for moth development — critical for nuts and dried fruits), inspect incoming product for infestation before storing (reject infested lots — even a small infestation can become severe within weeks), clean and disinfect empty storage bins/bags before filling (cracks and crevices harbour larvae and pupae), seal cracks and crevices in storage structures (prevents moth entry and hiding), use hermetic storage bags (PICS bags — triple-layer hermetic bags that prevent moth entry and suffocate any insects already in the product), apply diatomaceous earth (DE) @ 1 kg/tonne of product as a preventive treatment (safe, long-lasting), apply Bacillus thuringiensis (Bt) @ 200 g/tonne of product as a preventive treatment, install Cadra pheromone traps @ 4/1,000 m² for early detection and mass trapping, install insect-proof screens on storage ventilors (mesh size <1 mm), maintain storage temperature below 20°C if possible (slows moth development — practical for high-value nuts and dried fruits), practice First-In-First-Out (FIFO) stock rotation (do not store product for more than 6-12 months), do not mix old infested product with new product, inspect stored product weekly for webbing and adult moths (early detection critical — small infestations are easy to control, large infestations require fumigation), avoid spillage and dust accumulation in storage (these are ideal breeding sites), apply preventive insecticide treatment to empty storage structures before filling
🪴 Affected plants
- Stored Almonds (primary host), Stored Dates, Stored Figs, Stored Raisins, Stored Walnuts, Stored Cashews, Stored Pistachios, Stored Peanuts, Stored Rice, Stored Wheat, Stored Maize, Stored Cocoa Beans, Chocolate Confectionery, Other Stored Dry Food Products
🦋 Natural predators
- Trichogramma evanescens (egg parasitoid — limited efficacy in stored product), Bracon hebetor (larval parasitoid — limited efficacy), Habrobracon spp. (larval parasitoid — limited efficacy), predatory bugs (Xylocoris — limited efficacy), predatory mites (Cheyletus — limited efficacy), entomopathogenic fungus Beauveria bassiana (limited efficacy in dry stored product)
🌱 Host plants
- Prunus dulcis (stored almonds — primary host), Phoenix dactylifera (stored dates), Ficus carica (stored figs), Vitis vinifera (stored raisins), Juglans regia (stored walnuts), Anacardium occidentale (stored cashews), Pistacia vera (stored pistachios), Arachis hypogaea (stored peanuts), Oryza sativa (stored rice), Triticum aestivum (stored wheat), Zea mays (stored maize), Theobroma cacao (stored cocoa beans), chocolate confectionery
🔄 Lifecycle
- Adult moth emerges from pupa among the product.
- Female lays 150-300 eggs singly or in small groups on the product surface.
- Egg incubation 3-5 days.
- Larva passes through 5-7 instars over 14-22 days — spinning silken webs on the surface and feeding within.
- Larva pupates in a silken cocoon among the product.
- Pupal period 6-9 days.
- Adult lifespan 7-12 days; female may lay 150-300 eggs in her lifetime.
- Total life cycle 25-35 days at 25-30°C; 6-8 overlapping generations per year in stored product.
- Population peaks during warm humid conditions (Apr-Oct in tropical India).
📅 Season
- Active year-round in stored product; peaks Apr-Oct (warm humid conditions most favourable for moth development — corresponds to the pre-monsoon and monsoon period when product moisture tends to rise)
🔎 Appearance
- Adult is a small, slender, greyish-brown moth (family Pyralidae — snout moth); forewings greyish-brown with darker transverse lines and a distinctive dark band near the wing base; hindwings pale greyish-white with dark fringe; at rest the moth holds its wings tent-like over the body; labial palpi project forward like a snout.
- Larva is a small, cylindrical, dirty white to pinkish-cream caterpillar with a brown head; body sparsely covered with short setae; legs reduced.
- The larva characteristically spins silken webs on the surface of stored nuts, dried fruits and grains, contaminating the product with webbing, frass and exuviae.
- Pupa is small, brown, in a silken cocoon among the product.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Southeast Asia
- Cosmopolitan in Tropical
- Subtropical
- and Temperate Stored Product Worldwide
Have an Insect to Identify?
Upload or take a photo of an insect on your plant and our AI will identify it and recommend treatments.
📷 Diagnose from Image